Audio Systems: AC Adapter for Dockingk Audio Altec Lansing (XM), ac power source, watts rms

Question
I bought a Docking Audio for my XM Radio (MyFi).  I want to know wich kind of ac adapter (12v) I have to buy for it.
SPL 92dB, 6 Watts RMS (3 Watts / channel, @ 6ohms @ 10% THD),System response 80 Hz - 20 Hz (-10 dB).

Thank you

Answer
Not sure I understand your question as the MyFi comes with many accessories for use in the car.  Maybe you want to use it in home on 120v ac power source.

But the unit you have shown specifications for is the Altec docker and it comes with home power option.  If you want to power that with 12v you will need an inverter to go from 12v to 120v ac; just about any one you purchase will do the trick as the docker is not drawing very much current.  Here is one for $15 that would do the job for you.

http://www.nextag.com/12v-to-120v-ac-inverter/search-html

Hope this answers your question.
C